Write the negation of the following statements
(i) `sqrt(13)` is rational number
(ii) Both the diagonals of a rhombus are equal
(iii) All the sides of a regular polygon are equal

Explanation

To find the negation of the given statements, we need to express the opposite of each statement clearly. Let's go through each part step by step.

### Step 1: Negation of the first statement
**Statement:** `sqrt(13)` is a rational number.

**Negation:** The opposite of this statement is that `sqrt(13)` is not a rational number. Since a number is either rational or irrational, we can specify this negation as:
- `sqrt(13)` is an irrational number.

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